1784 in music

Events

• March - Wolfgang Amadeus Mozart gives the first performances of his Piano Concerto No. 15 at the Trattnerhof and Burgtheater in Vienna
• April 29 – Wolfgang Amadeus Mozart and violinist Regina Strinasacchi perform Mozart's Sonata in B flat for Violin and Keyboard (K.454) for the first time, in the presence of Joseph II, Holy Roman Emperor.
• June 13 – Wolfgang Amadeus Mozart's Piano Concerto No. 17 is performed for the first time, by his student, Barbara von Ployer. Giovanni Paisiello is in the audience.
• December 11 - Mozart is received into the Masonic lodge "Beneficence".

Classical music

• Michael Haydn – Symphony in B flat major; Symphony in C major
• Giovanni Battista Viotti – Duetto concertante for 2 Violins in D major; Duetto concertante for 2 Violins in D minor

Opera

• André Grétry – Richard Coeur de Lion
• Joseph Haydn – Armida
• Thomas Linley – The Spanish Rivals
• Antonio Salieri
  • Les Danaïdes
  • Il ricco d'un giorno (libretto by Lorenzo Da Ponte)
• Andrea Luchesi – Ademira
• Giovanni Paisiello – Il Re Teodoro

Births

• January 1 – William Beale, composer and organist
• January 27 – Martin-Joseph Mengal, composer
• January 29 – Ferdinand Ries, composer
• January 31 – Carl Wilhelm Henning, composer
• February 3 – John Fane, composer and diplomat
• February 27 – Job Plimpton, composer
• April 8 – Dionisio Aguado, guitarist and composer
• July 27 – George Onslow, composer
• August 5 – Louis Spohr, composer, violinist and conductor
• August 23 – Jeanette Wässelius, operatic soprano
• September 7 – Frantisek Max Knize, composer
• October 15 – Thomas Hastings, composer
• November 7 – Friedrich Wilhelm Kalkbrenner, German pianist and composer
• December 1 -Francois Henri Joseph Castil-Blaze, composer

Deaths

• January 11 – Ferdinand Philipp Joseph Lobkowitz, composer
• February 24 – Anton Laube, composer
• March 4 – Ann Cargill, opera singer (b. 1760) (drowned)
• July 1 – Wilhelm Friedemann Bach, composer (b. 1710)
• August – Louis Anseaume, opera librettist
• August 6 – Karl Kohaut, lutenist and composer (b. 1726)
• August 4 – Giovanni Battista Martini, composer (b. 1706)
• September 12 – Manuel Blasco de Nebra, organist and composer (b. 1750)
• September 27 – Boniface Stoecki, composer
• date unknown
  • John Bennett, organist and composer (b. c. 1735)
  • Anine Frölich, ballet dancer (b. 1762)
  • Carlo Ferdinando Landolfi, luthier (b. c. 1710)
  • Maria Linley singer (b. 1763)